Color-Difference Metrics: Task Performance Prediction for Multichromatic CRTApplications as Determined by Color Legibility

摘要

Previous research has assessed the prediction of legibility using various color-difference metrics for multichromatic displays. In this prior research, the 1976 CIE metrics deltaE l*u*v* and deltaE L*a*b* were poor predictors of reading speed of random numerals on a color CRT. In comparison, a weighted measure (wtd L*u*v*) and a new measure (Yu'v') were shown to have good predictability. This experiment was designed to extend the previous research to two different visual tasks: reading of text and random search for an alphanumeric target. Independent variables for both tasks were target (or text) chromaticity, background chromaticity, and target/background luminance contrast. Results indicate that mean reading speeds of the two tasks were highly correlated (r=.91) across the 147 experimental conditions, and that performance of both tasks was predicted best by wtd L*u*v* and Yu'v' (.765 < or = .835) but poorly predicted by deltaE L*u*v* and deltaE L*a*b* (.179 < or = .461).